Andrew Kreisberg, second from right, is shown with 'The Flash' team at Comic-Con. (Jay L. Clendenin / Los Angeles Times)

Warner Bros. confirmed it has suspended Andrew Kreisberg, an executive producer on The CW's "Arrow," "Supergirl," "The Flash" and "DC's Legends of Tomorrow," after opening an investigation into allegations of sexual harassment.

The allegations by 19 unnamed sources, including 15 women and four men, appeared Friday in Variety and detailed a pattern of misconduct over a period of years. According to Variety the sources chose to remain anonymous for fear of retaliation. Kreisberg has denied the allegations, which include frequent touching without permission, asking for massages from female staff members and sexualized comments about women's appearances.

Berlanti Productions, which oversees Kreisberg's shows, issued a statement signed by heads Greg Berlanti and Sarah Schechter stating, "We were recently made aware of some deeply troubling allegations regarding one of our showrunners. We have been encouraging and fully cooperating with the investigation into this by Warner Bros.

"There is nothing more important to us than the safety and well-being of our cast, crew, writers, producers and any staff. We do not tolerate harassment and are committed to doing everything we can to make an environment that’s safe to work in and safe to speak up about if it isn’t."

Warner Bros. Television Group also issued a statement that read, "We have recently been made aware of allegations of misconduct against Andrew Kreisberg. We have suspended Mr. Kreisberg and are conducting an internal investigation. We take all allegations of misconduct extremely seriously, and are committed to creating a safe working environment for our employees and everyone involved in our productions."